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Upside Down Catfish Sick? Please help!

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Hello everyone,

I have 3 upside down catfish in a 125 gallon tank with some guppies, Baka sharks, and iridescent sharks. One of the catfish has appeared to get smaller and I can see its bones where the fins were. He is still eating quite aggressively and swims as usual but I'm concerned he has some sort of infection? My other guess was that the other catfish were attacking him as he is the smallest of the three...any ideas? I'll try and add some pictures if I can get him to come out. Thanks in advance!